big noise

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌbig ˈnoise noun [countable]  informalIMPORTANTPOWER an important and powerful person in an organization 要人；有影响力的人

Examples from the Corpus

big noise• He's a big noise now; at least he imagines he is.

ˌbig ˈnoise nounChineseSyllable  

and in organization Corpus person powerful an an important

big noise
ˌbig ˈnoise noun [countable]
informal an important and powerful person in an organization